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Section P-501 General Requirements for Traps

Philadelphia Plumbing Code > 5 Traps, Cleanouts, Interceptors, and Backwater Valves > P-501 General Requirements for Traps

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P-501.1 Method

Each plumbing fixture or waste inlet shall be separately trapped by a trap integral with the plumbing fixture, or by a waterseal trap placed as near to the fixture or waste inlet as possible.

Exceptions:

A combination fixture having only one trap, provided that no separate compartment of such fixture is deeper than any other compartment connected to the same trap, and the waste outlets of such compartments are not more than 30 inches apart.
Kitchen sinks with two compartments of different levels and having a continuous waste and one trap. The trap and waste line shall be 1-1/2 inches minimum.

Figure P-501.1 Exc. #2

KITCHEN SINK

Figure P-501.1 Exc. #3

KITCHEN SINK
Kitchen sinks with three compartments, where one or more may be of different levels and having continuous waste and one trap. In accordance with Section P-506.1, the trap and waste line shall be 2 inches minimum.
A set of three single compartment laundry trays which are connected to one trap, provided that the waste outlets are no more than 30 inches apart, and the trap is centrally located.

Figure P-501.1 Exc. #4

LAUNDRY TRAY
Dishwasher wastes which are discharged through a directional flow fitting located in the sink fixture trap or in the garbage grinder, provided a fixture drain loop is installed on the dishwasher waste to the highest point below the fixture rim and the distance on center between the waste outlets of the sink and the dishwasher does not exceed 6 feet.

Figure P-501.1 Exc. #5

DISHWASHER

P-501.2 Prohibited Traps

The use or installation of the following types of traps is prohibited:

Any trap whose seal depends upon the action of movable parts;
Any trap with interior partitions, except when integral with vitrified clay plumbing fixtures;
Double traps, unless a fresh air inlet is connected to the system between the traps;
Crown-vented traps.

P-501.3 Trap Seal

Each fixture trap shall have a water seal.

Each fixture trap, except those cast integral or in combination with fixtures in which the trap seal is readily accessible, or except when a portion of the trap is readily removable for cleaning purposes, shall have an accessible brass or nylon resin trap screw of ample size.

P-501.5 Trap Levels and Protection

All traps shall be set true with respect to their water levels and shall be protected from freezing and evaporation and other loss of seal.

P-501.6 Traps for Floor Drains

All floor drains, including cellar drains, shall be trapped. Floor drain traps shall be located at such depth below the drain inlet as to be readily accessible for cleaning. A cleanout is not required for a floor drain. A trap primer shall be installed when required by Section P-1204.3.

P-501.7 House Traps

An approved house trap shall be installed in each sanitary house drain and in each house storm drain located within the property line of the building they serve, and shall be located at the curb line or in the building just inside the foundation wall. There shall be an air inlet for fresh air entering the house drain just inside the water seal of the trap.

Exception: Individual on-site subsurface sewage disposal system. (See Section P-1401.2)